Three-dimensional nanomagnetism: from textures in the bulk to patterned magnetic nanostructures

Stuttgarter Physikalisches Kolloquium

  • Date: Jun 8, 2021
  • Time: 04:15 PM (Local Time Germany)
  • Speaker: Claire Donnelly
  • MPI CPfS Dresden
  • Location: MPI-FKF Stuttgart
  • Room: online
Three-dimensional nanomagnetism: from textures in the bulk to patterned magnetic nanostructures

Three dimensional magnetic systems promise signicant opportunities for applications, for example providing higher
density devices and new functionalities associated with complex topology and greater degrees of freedom. With recent
advances in both characterization and nanofabrication techniques, the experimental investigation of these complex
systems is now possible, opening the door to the elucidation of new properties and rich physics.
For the characterization of 3D nanomagnetic systems, we have developed techniques to map both the three-dimensional
magnetic structure, and its response to external excitations. In a rst demonstration of X-ray magnetic nanotomography,
we determined the complex magnetic structure within the bulk of a μm-sized soft magnetic pillar. The magnetic
conguration contained vortices and antivortices, as well as Bloch point singularities. With these new datasets comes a
new challenge concerning the identication of such nanoscale topological objects within complex reconstructed magnetic
congurations. To address this, we have recently implemented calculations of the magnetic vorticity, that make
possible the location and identication of 3D magnetic solitons, leading to the rst observation of nanoscale magnetic vortex
rings.
In addition to the static magnetic structure, the dynamic response of the 3D magnetic conguration to excitations is key to
our understanding of both fundamental physics, and applications. With our recent development of X-ray magnetic
laminography, it is now possible to determine themagnetisation dynamics of a three-dimensional magnetic system.
Finally, recent advances in nanofabrication make possible the fabrication of complex 3D magnetic nanostructures,
leading to the realisation of articial chiral structures and 3D spintronic devices. These new experimental
capabilities for 3D magnetic systems open the door to complex three-dimensional magnetic structures, and their dynamic
behaviour.

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